Methods

DIRECT GEOCHEMICAL provides a broad range of geochemical exploration methods that are carefully tailored to specific project needs. The ideal strategy is to apply a multi-component approach to exploration, incorporating hydrocarbon and non-hydrocarbon data to enhance model accuracy and increase the understanding of the prospect. In each project, several factors are considered in the development of the survey design and these include (1) subsurface and surficial geology, (2) target types (i.e., oil, gas, CBM), (3) access and political considerations, and (4) cost.

The three key elements to a geochemical survey are sampling, analysis and interpretation. The elements are intricately linked, and quality must be maintained within each of them to ensure that results are meaningful.

Sampling Methods

Soil type, access, climate, and topography must be considered in the selection of sampling methods. Consultation with our geochemists will help to determine the best sampling method for a particular environment. Shallow soil samples may be obtained by hand probes, augers, or shovels. Deep soil samples and whole soil gas samples are obtained using ATV- or truck-mounted percussion sampling tools. VaporTecTM passive soil gas samples can be used where quality soil samples cannot be acquired, including under muskeg swamps, shallow water bodies and sand or gravel deposits. Offshore sediment samples can obtained with gravity, piston or vibration coring devices. Click Here for more information on sampling methods.

Analytical Options

The selection of an analytical method is the first of two key elements in tailoring a survey to the needs of a project. The first consideration is that of the reservoir fluid: dry gas, wet gas, condensate, black oil, coal bed methane, geothermal, etc. To be reliable, surface geochemical anomalies must be traced back to their subsurface sources and the processes by which they were created and emplaced. The analytical decision therefore begins with the targeted components. For gas, light hydrocarbon (C1-C6) analysis by GC/FID may be the right starting point. Synchronous Scanned Fluorescence (SSF) or an extended range analysis for heavier hydrocarbons (GC/PID-FID or GC/MS) would be appropriate for an oil or gas condensate target. Trace element and redox analysis of soil by ICP-ES or ICP-MS can provide additional pathfinders to underlying reservoirs and structural trends. Laboratory quality control and quality assurance procedures are vital to the production of reliable data for meaningful interpretation. DIRECT GEOCHEMICAL uses the highest level of quality control for analyses that is based on EPA methods used in environmental investigations. These protocols involve frequent calibration of instruments and the insertion of standards, duplicates, and blanks to ensure that the concentration data generated are both accurate and precise. Click Here for more information on analytical options.

Interpretation and Mapping

Multi-component geochemical anomalies can reflect subsurface hydrocarbons accumulations and their migration history, but it is important to first screen out potential false anomalies. For example, methane, ethene and other alkenes, terpenes, and furans can have vegetative or biogenic origins. It is therefore vital to separate petroleum related compounds from those generated by microbial activity in the near-surface environment. Click Here for more information on interpretation and mapping.

130 Capital Drive, Suite C  Golden, Colorado 80401  (303) 277-1694